Abstract Thiophosphate- and phosphate- based extractants, 1,3-bis(diethoxythiophosphinoyloxy)benzene (Ext 1) and 1,3-bis(diethoxyphosphinoyloxy)benzene (Ext 2), respectively, were synthesized and studied for their ability to extract Pd(II) from HCl and HNO3 media. Ext 1 (0.1 M) in 1-octanol selectively extracted 90–99.9% of Pd(II) in HCl (0.1–8.0 M) and 99.8% of Pd(II) in HNO3 (0.1–8.0 M) single-metal solutions, whereas Ext 2 demonstrated negligible Pd(II) extraction in either solution. The Pd(II) extraction rate, acid durability, optimal organic/aqueous (O/A) phase ratio, and Pd(II) loading capacity of Ext 1 were evaluated. Ext 1 was very stable in HCl and HCl/HNO3 solutions. Selective extraction of Pd(II) by Ext 1 (E% = 99%) was achieved from a solution containing Pd, Pt, Rh, rare metals, base metal ions, and leach liquors from automotive catalysts. Back-extraction of Pd(II) was performed using a solution of 0.1 M thiourea and 1.0 M HCl, allowing Ext 1 to be reused for 5 cycles. Ext 1 achieved rapid and selective extraction of Pd(II) from automotive catalyst solutions from platinum group metal refineries.

中文翻译：

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用新型硫代磷酸盐萃取剂溶剂萃取从汽车催化剂浸出液中回收 Pd(II)

摘要 合成了基于硫代磷酸盐和磷酸盐的萃取剂 1,3-双（二乙氧基硫代膦酰氧基）苯（Ext 1）和 1,3-双（二乙氧基膦酰氧基）苯（Ext 2），并研究了它们提取 Pd( II) 来自 HCl 和 HNO3 介质。Ext 1 (0.1 M) 在 1-辛醇中选择性萃取 90–99.9% 的 HCl (0.1–8.0 M) Pd(II) 和 HNO3 (0.1–8.0 M) 单金属溶液中 99.8% 的 Pd(II)，而 Ext 2 在任一溶液中的 Pd(II) 萃取都可以忽略不计。评估了 Ext 1 的 Pd(II) 萃取率、耐酸性、最佳有机/水 (O/A) 相比和 Pd(II) 负载能力。Ext 1 在 HCl 和 HCl/HNO3 溶液中非常稳定。Ext 1 (E% = 99%) 从含有 Pd、Pt、Rh、稀有金属、贱金属离子、和从汽车催化剂中浸出液体。使用 0.1 M 硫脲和 1.0 M HCl 的溶液对 Pd(II) 进行反萃取，允许 Ext 1 重复使用 5 个循环。Ext 1 实现了从铂族金属精炼厂的汽车催化剂溶液中快速选择性地提取 Pd(II)。